CN117005485A - Hydraulic excavator control system, hydraulic excavator and control method - Google Patents

Abstract

The invention discloses a hydraulic excavator control system, a hydraulic excavator and a control method, wherein the control system comprises the following components: the input device is used for transmitting the target required current, the first target current and the second target current of the electric control pump input by a user to the controller; the controller is used for controlling to open the electric control pump and the cab ascending electromagnetic valve or the electric control pump and the cab descending electromagnetic valve according to the received cab ascending signal or the cab descending signal, controlling the electric control pump to work according to the target demand current, and controlling the opening of the cab ascending electromagnetic valve or the cab descending electromagnetic valve according to the first target current and the second target current so as to control the ascending or descending speed of the cab, so that the automatic regulation of the cab ascending or descending speed is realized, the phenomenon of shaking of the cab is avoided, the comfort of a driver can be improved, and the mechanical service life of the hydraulic excavator is further prolonged.

Description

Hydraulic excavator control system, hydraulic excavator and control method

Technical Field

The invention relates to the technical field of hydraulic excavators, in particular to a hydraulic excavator control system, a hydraulic excavator and a control method.

Background

At present, as working conditions of engineering machinery become more and more complex, the height drop of the working environment is larger, and the traditional fixed cab can not meet the visual field and the operation requirement of the cab. In order to meet market demands, a machine type with a lifting cab function is provided, and most lifting cabs drive a lifting mechanism to operate in a hydraulic cylinder mode.

In the prior art, a plurality of hydraulic cylinders are arranged at the bottom of the cab, the cab is driven by the driving of the hydraulic cylinders to carry out lifting adjustment, once the flow of a main mechanical pump is overlarge, the lifting speed of the cab is not well controlled, and the phenomenon of shaking easily occurs. In the prior art, the lifting cab mostly can not meet the free regulation function of the lifting speed by manually regulating the hydraulic valve according to the operation habits of different drivers under different working conditions.

Disclosure of Invention

The invention provides a hydraulic excavator control system, a hydraulic excavator and a control method, which are used for realizing automatic control of the opening of a cab ascending electromagnetic valve and the opening of a cab descending electromagnetic valve, and further realizing automatic adjustment of the lifting speed of a cab; through independently adjusting the lifting speed of the cab, the phenomenon of shaking of the cab can be avoided, the comfort of a driver can be improved, and the service life of the hydraulic excavator can be prolonged.

According to an aspect of the present invention, there is provided a hydraulic shovel lifting cab control system including:

the device comprises an input device, a controller, an electric control pump, a cab ascending switch, a cab descending switch, a cab ascending electromagnetic valve and a cab descending electromagnetic valve;

the input device is connected with the controller and is used for receiving the target required current, the first target current and the second target current of the electric control pump input by a user and transmitting the target required current, the first target current and the second target current of the electric control pump input by the user to the controller;

the electric control pump is connected with the controller and is used for controlling the ascending or descending of the cab and controlling the flow of hydraulic oil required by the ascending or descending of the cab according to the control signal of the electric control pump sent by the controller;

the control device comprises a controller, a cab lifting switch, a cab lifting electromagnetic valve, a first target current and a second target current, wherein the cab lifting switch and the cab lifting electromagnetic valve are connected with the controller;

The controller is used for receiving the cab descending signal, controlling to open the electric control pump and the cab descending electromagnetic valve according to the received cab descending signal, controlling the electric control pump to work according to the target demand current, and controlling the opening of the cab descending electromagnetic valve according to the first target current and the second target current so as to control the descending speed of the cab.

Further, the controller is configured to:

after receiving the cab lifting signal, controlling the opening of the cab lifting electromagnetic valve according to the first target current in a first stage in the cab lifting process, and controlling the opening of the cab lifting electromagnetic valve according to the second target current in a second stage in the cab lifting process; the first stage in the cab lifting process is located before the second stage in the cab lifting process;

after receiving the cab lifting stop signal, controlling the opening of the cab lifting electromagnetic valve according to the second target current in a first stage in the cab lifting stopping process, and controlling the opening of the cab lifting electromagnetic valve according to the first target current in a second stage in the cab lifting stopping process; the first stage in the process of stopping the lifting of the cab is positioned before the second stage in the process of stopping the lifting of the cab;

After receiving the cab descending signal, controlling the opening of the cab descending electromagnetic valve according to the first target current in a first stage in the cab descending process, and controlling the opening of the cab descending electromagnetic valve according to the second target current in a second stage in the cab descending process; the first stage in the process of the cab descending is positioned before the second stage in the process of the cab descending;

after receiving the cab descent stop signal, controlling the opening of the cab descent solenoid valve according to the second target current at a first stage in the cab descent stop process, and controlling the opening of the cab descent solenoid valve according to the first target current at a second stage in the cab descent stop process; the first stage in the process of stopping the descent of the cab is located before the second stage in the process of stopping the descent of the cab.

Further, the hydraulic excavator lifting cab control system further includes: a proximity switch sensor;

the input device is used for receiving a third target current, a fourth target current and a fifth target current input by a user;

the proximity switch sensor is used for sending a cab ascending limit signal to the controller after detecting that the cab ascends to the limit position;

The controller is used for controlling the opening of the cab lifting electromagnetic valve according to the third target current and the fourth target current or controlling the opening of the cab lifting electromagnetic valve according to the fifth target current after receiving the cab lifting limit signal;

the proximity switch sensor is used for sending a cab descending limit signal to the controller after detecting that the cab descends to the limit position;

the controller is used for controlling the opening of the cab descending electromagnetic valve according to the third target current and the fourth target current or controlling the opening of the cab descending electromagnetic valve according to the fifth target current after receiving the cab descending limit signal.

Further, the controller is configured to:

after receiving the cab lifting limit signal, if the opening of the cab lifting electromagnetic valve is in a full-open state, controlling the opening of the lifting electromagnetic valve according to a third target current in a third stage in the process of stopping lifting of the cab, and controlling the opening of the lifting electromagnetic valve according to a fourth target current in a fourth stage in the process of stopping lifting of the cab; the third stage in the process of stopping the lifting of the cab is positioned before the fourth stage in the process of stopping the lifting of the cab;

after receiving the cab descending limit signal, if the opening of the cab descending electromagnetic valve is in a full-open state, controlling the opening of the descending electromagnetic valve according to a third target current in a third stage in the process of stopping the cab descending, and controlling the opening of the descending electromagnetic valve according to a fourth target current in a fourth stage in the process of stopping the cab descending; the third stage in the process of stopping the ascent of the cab is located before the fourth stage in the process of stopping the ascent of the cab.

Further, the controller is configured to:

after receiving the cab lifting limit signal, if the opening of the cab lifting electromagnetic valve is in a non-full-open state, controlling the opening of the lifting electromagnetic valve according to a fifth target current in a fifth stage in the process of stopping lifting of the cab;

and after receiving the cab descending limit signal, if the opening of the cab descending electromagnetic valve is in a non-full-open state, controlling the opening of the descending electromagnetic valve according to a fifth target current in a fifth stage in the process of stopping the cab descending.

Further, the hydraulic excavator lifting cab control system also comprises a cab emergency descending switch;

the cab emergency descent switch is used for sending a cab emergency descent signal to the controller when the cab emergency descent switch is triggered by a user;

the controller is used for controlling the cab emergency descent electromagnetic valve to open after receiving the emergency descent signal.

Further, the hydraulic excavator lifting cab control system also comprises an emergency descending manual valve;

the emergency descent manual valve is used for controlling the emergency descent of the cab according to the operation of a user outside the cab when the emergency descent switch of the cab is abnormal.

Further, the hydraulic excavator lifting cab control system further includes: a neutral position cut-off solenoid valve and a lifting interlocking solenoid valve; the middle position cutting electromagnetic valve and the lifting interlocking electromagnetic valve are connected with the controller, the middle position cutting electromagnetic valve is used for prohibiting the electric control pump from providing hydraulic oil for other hydraulic systems in the whole vehicle, and the lifting interlocking electromagnetic valve is used for ensuring that the whole vehicle only performs lifting operation of a cab;

The controller is used for:

after receiving the cab ascending signal or the cab descending signal, controlling the neutral position cutting electromagnetic valve and the lifting interlocking electromagnetic valve to be opened; after receiving the cab up stop signal or the cab down stop signal, the neutral position cut solenoid valve and the lift interlock solenoid valve are controlled to be closed.

Further, the controller is configured to:

when the real-time rotating speed of the engine is lower than the target rotating speed of the engine, if an emergency descending signal is received, the emergency descending electromagnetic valve of the cab is controlled to be opened;

or when the interruption time of the controller and the input device exceeds the first preset time and/or the interruption time of the controller and the engine controller exceeds the first preset time, if an emergency descent signal is received, the emergency descent electromagnetic valve of the cab is controlled to be opened.

According to another aspect of the present invention, there is provided a hydraulic excavator including a hydraulic excavator lift cab control system that performs any of the above embodiments.

According to another aspect of the present invention, there is provided a hydraulic excavator control method applied to a hydraulic excavator lifting cab control system as described above, comprising:

after receiving the cab lifting signal, the controller controls and opens the electric control pump and the cab lifting electromagnetic valve according to the received cab lifting signal, controls the electric control pump to work according to the target demand current, and controls the opening of the cab lifting electromagnetic valve according to the first target current and the second target current so as to control the lifting speed of the cab;

After receiving the cab descending signal, the controller controls and opens the electric control pump and the cab descending electromagnetic valve according to the received cab descending signal, controls the electric control pump to work according to the target demand current, and controls the opening of the cab descending electromagnetic valve according to the first target current and the second target current at the same time so as to control the descending speed of the cab.

Further, after receiving the cab up signal, the controller further includes:

the controller judges whether the electric control pump reaches a target working state and whether the real-time rotating speed of the engine reaches the target rotating speed of the engine;

if yes, judging whether a cab ascending limit signal is detected;

if yes, controlling the opening of the cab lifting electromagnetic valve according to the third target current and the fourth target current, or controlling the opening of the cab lifting electromagnetic valve according to the fifth target current;

if not, the electric control pump and the cab lifting electromagnetic valve are controlled to be opened according to the received cab lifting signal, the electric control pump is controlled to work according to the target required current, and meanwhile, the opening degree of the cab lifting electromagnetic valve is controlled according to the first target current and the second target current, so that the lifting speed of the cab is controlled.

Further, after receiving the cab lowering signal, the controller further includes:

judging whether the electric control pump reaches a target working state and whether the real-time rotating speed of the engine reaches the target rotating speed of the engine;

if yes, judging whether a cab ascending limit signal is detected;

if yes, controlling the opening of the cab descending electromagnetic valve according to the third target current and the fourth target current or controlling the opening of the cab descending electromagnetic valve according to the fifth target current;

if not, the electric control pump and the cab descending electromagnetic valve are controlled to be opened according to the received cab descending signal, the electric control pump is controlled to work according to the target required current, and meanwhile, the opening degree of the cab descending electromagnetic valve is controlled according to the first target current and the second target current, so that the descending speed of the cab is controlled.

The control system for the lifting cab of the hydraulic excavator provided by the embodiment of the invention comprises the following components: the device comprises an input device, a controller, an electric control pump, a cab ascending switch, a cab descending switch, a cab ascending electromagnetic valve and a cab descending electromagnetic valve; transmitting a target required current, a first target current and a second target current of the electric control pump input by a user to a controller; according to the control signal of the electric control pump sent by the controller, the cab is controlled to ascend or descend; when the cab lifting switch is triggered by a user, a cab lifting signal is sent to the controller, the controller is used for receiving the cab lifting signal, controlling the electric control pump and the cab lifting electromagnetic valve to be opened according to the received cab lifting signal, controlling the electric control pump to work according to target required current, and controlling the opening of the cab lifting electromagnetic valve according to the first target current and the second target current so as to control the lifting speed of the cab; when the cab lowering switch is triggered by a user, a cab lowering signal is sent to the controller, the controller is used for receiving the cab lowering signal, controlling the electric control pump and the cab lowering electromagnetic valve to be opened according to the received cab lowering signal, controlling the electric control pump to work according to target required current, and controlling the opening of the cab lowering electromagnetic valve according to the first target current and the second target current so as to control the lowering speed of the cab. According to the hydraulic excavator lifting cab control system provided by the embodiment of the invention, a user sets the first target current and the second target current according to the actual requirement of operation, so that the automatic control of the opening of the cab lifting electromagnetic valve and the opening of the cab descending electromagnetic valve is realized, and the automatic regulation of the lifting speed of the cab is further realized; through independently adjusting the lifting speed of the cab, the phenomenon of shaking of the cab can be avoided, the comfort of a driver can be improved, and the service life of the hydraulic excavator can be prolonged.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a control system for a lifting cab of a hydraulic excavator according to an embodiment of the present invention;

FIG. 2 is a graph of solenoid current versus open time provided in accordance with an embodiment of the present invention;

FIG. 3 is a graph of solenoid current versus open time for another embodiment of the present invention;

FIG. 4 is a graphical illustration of solenoid current versus open time provided in accordance with an embodiment of the present invention;

FIG. 5 is a flow chart of a hydraulic shovel control method provided according to an embodiment of the present invention;

Fig. 6 is a flowchart of an operation process of a control system for a lifting cab of a hydraulic excavator according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

An embodiment of the present invention provides a control system for a lifting cab of a hydraulic excavator, and fig. 1 is a schematic structural diagram of the control system for a lifting cab of a hydraulic excavator according to an embodiment of the present invention, and referring to fig. 1, the control system for a lifting cab of a hydraulic excavator includes:

an input device 1, a controller 2, an electric control pump 3, a cab lifting switch 4, a cab lowering switch 5, a cab lifting solenoid valve 6 and a cab lowering solenoid valve 7;

the input device 1 is connected with the controller 2, and is used for receiving target required current, first target current and second target current of the electric control pump 3 input by a user and transmitting the target required current, the first target current and the second target current of the electric control pump 3 input by the user to the controller;

the electric control pump 3 is connected with the controller 2, and controls the ascending or descending of the cab and the flow of hydraulic oil required by the ascending or descending of the cab according to an electric control pump control signal sent by the controller 2;

the cab lifting switch 4 and the cab lifting electromagnetic valve 6 are connected with the controller 2, the cab lifting switch 4 is used for sending cab lifting signals to the controller 2 when being triggered by a user, the controller 2 is used for receiving the cab lifting signals, controlling the electric control pump 3 and the cab lifting electromagnetic valve 6 according to the received cab lifting signals, controlling the electric control pump 3 to work according to target required current, and controlling the opening of the cab lifting electromagnetic valve 6 according to first target current and second target current so as to control the lifting speed of the cab;

The cab-lowering switch 5 is used for sending a cab-lowering signal to the controller 2 when triggered by a user, the controller 2 is used for receiving the cab-lowering signal, controlling and opening the electric control pump 3 and the cab-lowering electromagnetic valve 7 according to the received cab-lowering signal, controlling the electric control pump 3 to work according to a target required current, and controlling the opening of the cab-lowering electromagnetic valve 7 according to a first target current and a second target current at the same time so as to control the lowering speed of the cab.

The target required current, the first target current and the second target current may be set according to actual situations, which is not limited in the embodiment of the present invention.

Specifically, after the hydraulic excavator lifting cab control system is powered on, at this time, a user can input the target required current, the first target current and the second target current of the electric control pump 3 required at this time through an input device, and the target required current, the first target current and the second target current of the electric control pump 3 input by the user are transmitted to the controller 2, the engine is started, and a pilot is opened, wherein the pilot refers to a technical system capable of effectively predicting and controlling mechanical movement when the excavator performs construction work. The target demand current, the first target current, and the second target current may be input at any time the hydraulic shovel is operated.

When receiving the cab up signal or the cab down signal, the controller 2 first determines whether the electronic control pump 3 reaches a target operating state, and whether the real-time rotational speed of the engine reaches a target rotational speed of the engine, where the target rotational speed is a rotational speed required by the engine when the cab performs the up-down operation. If the real-time rotation speed of the engine is not matched with the target rotation speed, the controller 2 sends a command for controlling the engine to run at the target rotation speed to the engine controller 8 again, finally, the maximum flow of hydraulic oil output by the electric control pump 3 is determined through the target rotation speed of the engine and the target required current of the electric control pump 3, the maximum speed of ascending or descending of the cab can be determined, the actual flow of hydraulic oil output by the electric control pump 3 can be adjusted through the opening of the cab ascending electromagnetic valve 6 or the cab descending electromagnetic valve 7, and therefore the actual ascending speed or the actual descending speed of the cab can be adjusted. If the electric control pump 3 reaches a target working state and the real-time rotating speed of the engine reaches the target rotating speed of the engine, when the controller 2 receives a cab lifting signal, controlling the opening of the cab lifting electromagnetic valve 6 according to the first target current and the second target current so as to control the lifting speed of the cab; when the controller 2 receives the cab-down signal, the opening of the cab-down solenoid valve 7 is controlled according to the first target current and the second target current to control the down speed of the cab, and illustratively, after receiving the cab-up signal, the opening of the cab-up solenoid valve 6 is controlled according to the first target current in the first stage of the cab-up process, and the opening of the cab-up solenoid valve 6 is controlled according to the second target current in the second stage of the cab-up process; after receiving the cab-lowering signal, the opening of the cab-lowering solenoid valve 7 is controlled according to the first target current in a first stage during the cab-lowering process, and the opening of the cab-lowering solenoid valve 7 is controlled according to the second target current in a second stage during the cab-lowering process, wherein the first stage during the cab-raising process is located before the second stage during the cab-raising process.

The control system for the lifting cab of the hydraulic excavator provided by the embodiment of the invention comprises the following components: an input device 1, a controller 2, an electric control pump 3, a cab lifting switch 4, a cab lowering switch 5, a cab lifting solenoid valve 6 and a cab lowering solenoid valve 7; by transmitting the target demand current, the first target current, and the second target current of the electronically controlled pump 3, which are input by the user, to the controller 2; according to the control signal of the electric control pump sent by the controller 2, the cab is controlled to ascend or descend; when the cab lifting switch 4 is triggered by a user, a cab lifting signal is sent to the controller 2, the controller 2 is used for receiving the cab lifting signal, controlling and opening the electric control pump 3 and the cab lifting electromagnetic valve 6 according to the received cab lifting signal, controlling the electric control pump 3 to work according to a target required current, and controlling the opening of the cab lifting electromagnetic valve 6 according to a first target current and a second target current so as to control the lifting speed of the cab; when the cab-lowering switch 5 is triggered by a user, a cab-lowering signal is sent to the controller 2, the controller 2 is used for receiving the cab-lowering signal, controlling and opening the electric control pump 3 and the cab-lowering electromagnetic valve 7 according to the received cab-lowering signal, controlling the electric control pump 3 to work according to a target required current, and controlling the opening of the cab-lowering electromagnetic valve 7 according to a first target current and a second target current at the same time, so as to control the lowering speed of the cab. According to the hydraulic excavator lifting cab control system provided by the embodiment of the invention, a user sets the first target current and the second target current according to the actual requirement of operation, so that the automatic control of the opening of the cab lifting electromagnetic valve 6 and the opening of the cab descending electromagnetic valve 7 is realized, and the automatic regulation of the lifting speed of the cab is further realized; through independently adjusting the lifting speed of the cab, the phenomenon of shaking of the cab can be avoided, the comfort of a driver can be improved, and the service life of the hydraulic excavator can be prolonged.

Further, fig. 2 is a schematic diagram of a solenoid current versus an opening time according to an embodiment of the present invention, and referring to fig. 2, a controller is configured to:

after receiving the cab lifting signal, controlling the opening of the cab lifting electromagnetic valve according to the first target current X in a first stage in the cab lifting process, and controlling the opening of the cab lifting electromagnetic valve according to the second target current Y in a second stage in the cab lifting process; the first stage in the cab lifting process is located before the second stage in the cab lifting process;

after receiving the cab lifting stop signal, controlling the opening of the cab lifting electromagnetic valve according to the second target current Y in a first stage in the cab lifting stopping process, and controlling the opening of the cab lifting electromagnetic valve according to the first target current X in a second stage in the cab lifting stopping process; the first stage in the process of stopping the lifting of the cab is positioned before the second stage in the process of stopping the lifting of the cab;

after receiving the cab descending signal, controlling the opening of the cab descending electromagnetic valve according to the first target current X in a first stage in the cab descending process, and controlling the opening of the cab descending electromagnetic valve according to the second target current Y in a second stage in the cab descending process; the first stage in the process of the cab descending is positioned before the second stage in the process of the cab descending;

After receiving the cab descent stop signal, controlling the opening of the cab descent solenoid valve according to the second target current Y in a first stage in the cab descent stop process, and controlling the opening of the cab descent solenoid valve according to the first target current X in a second stage in the cab descent stop process; the first stage in the process of stopping the descent of the cab is located before the second stage in the process of stopping the descent of the cab.

Specifically, as shown in fig. 2, after receiving the cab lifting signal, a first stage in the cab lifting process can be determined according to the first target current X, wherein the first stage is a time period t0-t1, and since each current value corresponds to the opening of one cab lifting electromagnetic valve, the opening of the cab lifting electromagnetic valve can be determined according to the current value corresponding to each time in the first stage, so as to control the speed of the cab lifting process in the first stage; determining a second stage in the ascending process of the cab according to the second target current Y, wherein the second stage is a time period of t1-t2, and determining the opening of an ascending electromagnetic valve of the cab according to a current value corresponding to each moment in the second stage, so as to control the speed of the cab in the ascending process of the second stage; if the cab raising signal is received after the time t2, the third stage of the cab raising process is entered, and the speed of the cab raising process in the third stage is controlled by the opening of the cab raising solenoid valve corresponding to the second target current Y, that is, the 100% opening.

After receiving the cab lifting stop signal, namely after the user releases the trigger of the cab lifting switch, if the cab lifting stop signal is received after the time t2, determining a first stage in the process of stopping lifting of the cab according to a second target current Y, wherein the first stage is a time period t2-t1, determining the opening of a cab lifting electromagnetic valve according to a current value corresponding to each moment in the first stage, further controlling the speed of stopping lifting of the cab in the first stage, determining a second stage in the process of stopping lifting of the cab according to the first target current X, wherein the second stage is a time period t1-t0, determining the opening of the cab lifting electromagnetic valve according to a current value corresponding to each moment in the second stage, and further controlling the speed of stopping lifting of the cab in the second stage; if a cab lifting stopping signal is received in a t2-t1 time period, determining the opening of the cab lifting electromagnetic valve at each moment according to the opening of the cab lifting electromagnetic valve at the moment and a current value corresponding to each moment in the first stage, further controlling the speed of the cab in the first stage in stopping lifting process, and determining a second stage in stopping lifting process of the cab according to a first target current X, wherein the second stage is a t1-t0 time period, and determining the opening of the cab lifting electromagnetic valve according to the current value corresponding to each moment in the second stage, further controlling the speed of the cab in stopping lifting process in the second stage; if the cab lifting stop signal is received in the time period from t1 to t0, the opening of the cab lifting electromagnetic valve at each moment can be determined according to the opening of the cab lifting electromagnetic valve at the moment and the current value corresponding to each moment in the second stage, and then the speed of the cab lifting process is controlled to stop in the second stage.

With continued reference to fig. 2, after receiving the cab descent signal, a first stage in the cab descent process may be determined according to the first target current X, where the first stage is a period of t0-t1, and since each current value corresponds to an opening of a cab descent solenoid valve, the opening of the cab descent solenoid valve may be determined according to the current value corresponding to each time in the first stage, so as to control a speed of the cab descent process in the first stage; determining a second stage in the descending process of the cab according to the second target current Y, wherein the second stage is a time period of t1-t2, and determining the opening of the descending electromagnetic valve of the cab according to the current value corresponding to each moment in the second stage, so as to control the speed of the cab in the descending process of the second stage; if the cab-descending signal is received after the time t2, the third stage of the cab-descending process is entered, and the speed of the cab-descending process in the third stage is controlled by the opening of the cab-descending solenoid valve corresponding to the second target current Y, namely, the opening of 100%.

After receiving the cab descent stopping signal, namely after the user releases the trigger of the cab descent switch, if the cab descent stopping signal is received after the time t2, determining a first stage in the process of stopping the cab descent according to a second target current Y, wherein the first stage is a time period t2-t1, determining the opening of a cab descent electromagnetic valve according to a current value corresponding to each time in the first stage, further controlling the speed of stopping the cab descent in the first stage, determining a second stage in the process of stopping the cab descent according to a first target current X, wherein the second stage is a time period t1-t0, determining the opening of the cab descent electromagnetic valve according to a current value corresponding to each time in the second stage, and further controlling the speed of stopping the cab descent in the second stage; if a cab descent stopping signal is received in a t2-t1 time period, determining the opening of the cab descent electromagnetic valve at each moment according to the opening of the cab descent electromagnetic valve at the moment and a current value corresponding to each moment in the first stage, further controlling the speed of the cab in the first stage in stopping the descent process, and determining a second stage in stopping the cab in the descent process according to a first target current X, wherein the second stage is a t1-t0 time period, and determining the opening of the cab descent electromagnetic valve according to the current value corresponding to each moment in the second stage, further controlling the speed of the cab in stopping the descent process in the second stage; if the cab descent stop signal is received in the time period t1-t0, the opening degree of the cab descent solenoid valve at each moment can be determined according to the opening degree of the cab descent solenoid valve at the moment and the current value corresponding to each moment in the second stage, and then the speed of the cab in the process of stopping descent in the second stage is controlled.

Further, referring to fig. 1, the hydraulic excavator lift cab control system further includes: a proximity switch sensor 9;

the input device is used for receiving a third target current, a fourth target current and a fifth target current input by a user;

the proximity switch sensor 9 is used for sending a cab lifting limit signal to the controller after detecting that the cab is lifted to the limit position;

the controller is used for controlling the opening of the cab lifting electromagnetic valve according to the third target current and the fourth target current or controlling the opening of the cab lifting electromagnetic valve according to the fifth target current after receiving the cab lifting limit signal;

the proximity switch sensor 9 is used for sending a cab descending limit signal to the controller after detecting that the cab descends to a limit position;

the controller is used for controlling the opening of the cab descending electromagnetic valve according to the third target current and the fourth target current or controlling the opening of the cab descending electromagnetic valve according to the fifth target current after receiving the cab descending limit signal.

The proximity switch sensor 9 may be a PNP type proximity switch sensor 9 or an NPN type proximity switch sensor 9, which is not limited in the embodiment of the present invention. The third target current, the fourth target current, and the fifth target current may be set according to actual conditions, which is not limited in the embodiment of the present invention. Illustratively, the proximity switch sensor 9 is adjustable in distance from the cab ascent limit position, and an adjustment range of different positions can be achieved.

Specifically, after receiving the cab lifting limit signal, the controller controls the opening of the cab lifting solenoid valve according to the third target current and the fourth target current if the opening of the cab lifting solenoid valve is in a full-open state, and controls the opening of the cab lifting solenoid valve according to the fifth target current if the opening of the cab lifting solenoid valve is in a non-full-open state; after receiving the cab-descending limit signal, the controller controls the opening of the cab-descending solenoid valve according to the third target current and the fourth target current if the opening of the cab-descending solenoid valve is in a fully-opened state, and controls the opening of the cab-descending solenoid valve according to the fifth target current if the opening of the cab-descending solenoid valve is in a non-fully-opened state.

Further, fig. 3 is a schematic diagram of another electromagnetic valve current versus opening time according to an embodiment of the present invention, and referring to fig. 3, the controller is configured to:

after receiving the cab lifting limit signal, if the opening of the cab lifting solenoid valve is in a full-open state, controlling the opening of the lifting solenoid valve according to a third target current Y1 in a third stage in the process of stopping lifting of the cab, and controlling the opening of the lifting solenoid valve according to a fourth target current X1 in a fourth stage in the process of stopping lifting of the cab; the third stage in the process of stopping the lifting of the cab is positioned before the fourth stage in the process of stopping the lifting of the cab;

After receiving the cab descending limit signal, if the opening of the cab descending electromagnetic valve is in a full-open state, controlling the opening of the descending electromagnetic valve according to a third target current Y1 in a third stage in the process of stopping the cab descending, and controlling the opening of the descending electromagnetic valve according to a fourth target current X1 in a fourth stage in the process of stopping the cab descending; the third stage in the process of stopping the ascent of the cab is located before the fourth stage in the process of stopping the ascent of the cab.

Specifically, as shown in fig. 3, after receiving the cab lifting signal, if the opening of the cab lifting electromagnetic valve is in a fully opened state, a third stage in the cab lifting process can be determined according to a third target current Y1, wherein the third stage is a period of t0-t11, and since each current value corresponds to the opening of one lifting electromagnetic valve, the opening of the lifting electromagnetic valve can be determined according to the current value corresponding to each time in the third stage, so as to further control the speed of the cab lifting process in the third stage; and determining a fourth stage in the ascending process of the cab according to the fourth target current X1, wherein the fourth stage is a time period from t11 to t12, and determining the opening of the ascending solenoid valve according to the current value corresponding to each moment in the fourth stage so as to control the speed of the cab in the ascending process of the fourth stage.

After receiving the cab descending signal, if the opening of the cab descending electromagnetic valve is in a fully-opened state, determining a third stage in the cab descending process according to a third target current Y1, wherein the third stage is a t0-t11 time period, and since each current value corresponds to the opening of the descending electromagnetic valve, the opening of the descending electromagnetic valve can be determined according to the current value corresponding to each time in the third stage, so as to control the speed of the cab in the third stage descending process; and determining a fourth stage in the descending process of the cab according to the fourth target current X1, wherein the fourth stage is a time period from t11 to t12, and determining the opening of the descending electromagnetic valve according to the current value corresponding to each moment in the fourth stage so as to control the speed of the descending process of the cab in the fourth stage.

Further, fig. 4 is a schematic diagram of still another electromagnetic valve current versus opening time according to an embodiment of the present invention, and referring to fig. 4, the controller is configured to:

after receiving the cab lifting limit signal, if the opening of the cab lifting electromagnetic valve is in a non-full-open state, controlling the opening of the lifting electromagnetic valve according to a fifth target current X2 in a fifth stage in the process of stopping lifting the cab;

After receiving the cab-descending limit signal, if the opening of the cab-descending solenoid valve is in a non-fully-opened state, controlling the opening of the descending solenoid valve according to a fifth target current X2 in a fifth stage in the process of stopping the cab from descending.

Specifically, as shown in fig. 4, after receiving the cab lifting limit signal, if the opening of the cab lifting solenoid valve is in a non-fully opened state, a fifth stage in the cab lifting process can be determined according to a fifth target current X2, wherein the fifth stage is a period of t0-t21, and since each current value corresponds to the opening of one lifting solenoid valve, the opening of the lifting solenoid valve can be determined according to the current value corresponding to each time in the fifth stage, so as to further control the speed of the cab lifting process in the fifth stage; after receiving the cab descent limiting signal, if the opening of the cab descent solenoid valve is in a non-fully opened state, a fifth stage in the cab descent process can be determined according to a fifth target current X2, wherein the fifth stage is a t0-t21 time period, and since each current value corresponds to the opening of the descent solenoid valve, the opening of the descent solenoid valve can be determined according to the current value corresponding to each moment in the fifth stage, so that the speed of the cab descent process in the fifth stage can be controlled.

Further, referring to fig. 1, the hydraulic excavator lifting cab control system further includes a cab emergency descent switch;

the cab emergency descent switch is used for sending a cab emergency descent signal to the controller when the cab emergency descent switch is triggered by a user;

the controller is used for controlling the cab emergency descent solenoid valve 10 to open after receiving the emergency descent signal.

Specifically, when an abnormality occurs in the engine speed, that is, the real-time speed of the engine is lower than the target speed of the engine or the interruption time of the controller and the input device and/or the engine controller 8 exceeds the first preset time, the user can control the opening of the cabin emergency descent solenoid valve 10 by triggering the cabin emergency descent switch, thereby controlling the cabin to descend in an emergency. The first preset duration may be set according to an actual situation, which is not limited in the embodiment of the present invention.

Further, the hydraulic excavator lifting cab control system also comprises an emergency descending manual valve;

the emergency descent manual valve is used for controlling the emergency descent of the cab according to the operation of a user outside the cab when the emergency descent switch of the cab is abnormal.

The emergency descending manual valve can be arranged on the hydraulic oil circuit platform. Specifically, when the emergency descending switch of the cab is abnormal and cannot be used normally, a user outside the cab can control the cab to descend emergently by controlling the emergency descending switch arranged on the hydraulic oil circuit platform.

Further, with continued reference to fig. 1, the hydraulic shovel lift cab control system further includes: a neutral position cut-off solenoid valve 11 and a lift interlock solenoid valve 12; the middle position cut-off electromagnetic valve 11 and the lifting interlocking electromagnetic valve 12 are connected with the controller, the middle position cut-off electromagnetic valve 11 is used for prohibiting the electric control pump from providing hydraulic oil for other hydraulic systems in the whole vehicle, and the lifting interlocking electromagnetic valve 12 is used for ensuring that the whole vehicle only performs lifting operation of a cab;

the controller is used for:

after receiving the cab up signal or the cab down signal, controlling the neutral position cut-off solenoid valve 11 and the lift interlock solenoid valve 12 to open; upon receiving the cab-up stop signal or the cab-down stop signal, the neutral position cutoff solenoid valve 11 and the lift interlock solenoid valve 12 are controlled to close.

Specifically, after receiving the cab up signal or the cab down signal, the controller controls the neutral position cut-off solenoid valve 11 and the lift interlock solenoid valve 12 to be opened to ensure the safety of the cab lifting operation; and after receiving the cab lifting stop signal or the cab descending stop signal, the potential safety hazard in the process of cab lifting operation is eliminated, so that the middle position cut-off solenoid valve 11 and the lifting interlocking solenoid valve 12 can be controlled to be closed.

Further, the input device comprises a touch screen display, and the touch screen display is used for receiving the cab lifting state signal sent by the controller and displaying the lifting state of the cab according to the cab lifting state signal.

The lifting state of the cab comprises one of a cab lifting state, a cab descending state or a cab emergency descending state.

Further, the controller is configured to:

when the real-time rotating speed of the engine is lower than the target rotating speed of the engine, if an emergency descending signal is received, the emergency descending electromagnetic valve of the cab is controlled to be opened;

or when the interruption time of the controller and the input device exceeds the first preset time and/or the interruption time of the controller and the engine controller exceeds the first preset time, if an emergency descent signal is received, the emergency descent electromagnetic valve of the cab is controlled to be opened.

Specifically, if the real-time rotation speed of the engine is lower than the target rotation speed of the engine, the engine is abnormal, the hydraulic excavator cannot work normally at the moment, and if an emergency descending signal is received, the cab emergency descending electromagnetic valve is controlled to be opened, and then the cab is controlled to descend emergently.

If the interruption time of the controller and the input device exceeds the first preset time and/or the interruption time of the controller and the engine controller exceeds the first preset time, the connection of the controller and the input device and/or the connection of the controller and the engine controller are abnormal, the hydraulic excavator cannot work normally at the moment, and if an emergency descending signal is received, the emergency descending electromagnetic valve of the cab is controlled to be opened, and the cab is controlled to descend emergently.

The embodiment of the invention provides a hydraulic excavator, which comprises the hydraulic excavator lifting cab control system. The hydraulic excavator provided by the embodiment of the invention comprises the hydraulic excavator lifting cab control system in any of the technical schemes, so that the hydraulic excavator lifting cab control system has the beneficial effects and is not repeated herein.

An embodiment of the present invention provides a hydraulic excavator control method, which is applied to the hydraulic excavator control system described in any of the above embodiments, and fig. 5 is a flowchart of a hydraulic excavator control method according to an embodiment of the present invention, and referring to fig. 5, the hydraulic excavator control method includes:

and S110, after receiving the cab lifting signal, the controller controls and opens the electric control pump and the cab lifting electromagnetic valve according to the received cab lifting signal, controls the electric control pump to work according to the target required current, and controls the opening of the cab lifting electromagnetic valve according to the first target current and the second target current so as to control the lifting speed of the cab.

And S120, after receiving the cab descending signal, the controller controls and opens the electric control pump and the cab descending electromagnetic valve according to the received cab descending signal, controls the electric control pump to work according to the target required current, and controls the opening of the cab descending electromagnetic valve according to the first target current and the second target current so as to control the descending speed of the cab.

The hydraulic excavator control method designed by the embodiment of the invention is applied to the hydraulic excavator control system in any of the embodiments, after the controller receives the cab lifting signal, the controller controls the electric control pump and the cab lifting electromagnetic valve to be opened according to the received cab lifting signal, controls the electric control pump to work according to the target required current, and controls the opening of the cab lifting electromagnetic valve according to the first target current and the second target current so as to control the lifting speed of the cab; meanwhile, after receiving a cab descending signal, the controller controls and opens the electric control pump and the cab descending electromagnetic valve according to the received cab descending signal, controls the electric control pump to work according to the target demand current, and controls the opening of the cab descending electromagnetic valve according to the first target current and the second target current so as to control the descending speed of the cab, so that the automatic control of the opening of the cab ascending electromagnetic valve and the opening of the cab descending electromagnetic valve is realized, and the automatic regulation of the lifting speed of the cab is realized; through independently adjusting the lifting speed of the cab, the phenomenon of shaking of the cab can be avoided, the comfort of a driver can be improved, and the service life of the hydraulic excavator can be prolonged.

Further, after receiving the cab up signal, the controller further includes:

the controller judges whether the electric control pump reaches a target working state and whether the real-time rotating speed of the engine reaches the target rotating speed of the engine;

if yes, judging whether a cab ascending limit signal is detected;

if yes, controlling the opening of the cab lifting electromagnetic valve according to the third target current and the fourth target current, or controlling the opening of the cab lifting electromagnetic valve according to the fifth target current;

if not, the electric control pump and the cab lifting electromagnetic valve are controlled to be opened according to the received cab lifting signal, the electric control pump is controlled to work according to the target required current, and meanwhile, the opening degree of the cab lifting electromagnetic valve is controlled according to the first target current and the second target current, so that the lifting speed of the cab is controlled.

Further, after receiving the cab lowering signal, the controller further includes:

judging whether the electric control pump reaches a target working state and whether the real-time rotating speed of the engine reaches the target rotating speed of the engine;

if yes, judging whether a cab ascending limit signal is detected;

if yes, controlling the opening of the cab descending electromagnetic valve according to the third target current and the fourth target current or controlling the opening of the cab descending electromagnetic valve according to the fifth target current;

If not, the electric control pump and the cab descending electromagnetic valve are controlled to be opened according to the received cab descending signal, the electric control pump is controlled to work according to the target required current, and meanwhile, the opening degree of the cab descending electromagnetic valve is controlled according to the first target current and the second target current, so that the descending speed of the cab is controlled.

Fig. 6 is a flowchart illustrating an operation procedure of a hydraulic excavator lifting cab control system according to an embodiment of the present invention, and referring to fig. 6, the operation procedure of the hydraulic excavator lifting cab control system includes:

s110, powering up the system; step S120 is performed.

S120, judging whether the engine is started or not; if yes, step S130 is executed, and if not, step S170 is executed.

S130, judging whether the pilot is unlocked or not; if yes, go to step S141, if not, go to step S170.

S141, judging whether a cab rising signal is detected; if yes, step S142 is executed, and if not, step S151 is executed.

S142, judging whether the electric control pump reaches a target working state and whether the real-time rotating speed of the engine reaches the target rotating speed of the engine; if yes, go to step S143, if not, go back to step S141.

S143, judging whether a cab lifting limit signal is detected; if yes, step S145 is executed, and if not, step S144 is executed.

S144, controlling the cab lifting electromagnetic valve to open according to the first target current and the second target current; step S160 is performed.

S145, controlling the cab lifting electromagnetic valve to finish working according to the third target current, the fourth target current or the fifth target current; step S200 is performed.

S151, judging whether a cab lowering signal is detected; if yes, step S152 is executed, and if not, step S170 is executed.

S152, judging whether the electric control pump reaches a target working state and whether the real-time rotating speed of the engine reaches the target rotating speed of the engine; if yes, step S153 is executed, and if not, step S151 is executed again.

S153, judging whether a cab descent limiting signal is detected; if yes, go to step S155, if not, go back to step S154.

S154, controlling a cab descent electromagnetic valve to open according to the first target current and the second target current; step S160 is performed.

S155, controlling the cab descent electromagnetic valve to finish working according to the third target current, the fourth target current or the fifth target current; step S200 is performed.

S160, opening the middle position cutting electromagnetic valve and the lifting interlocking electromagnetic valve; step S200 is performed.

S170, judging whether the real-time rotating speed of the engine is lower than the target rotating speed of the engine or the interruption time of the controller and the input device and/or the engine controller exceeds a first preset time; if yes, go to step S180, if not, go back to step S200.

S180, judging whether an emergency descending signal of a cab is received or not; if yes, go to step S190, if not, go back to step S200.

S190, opening an emergency descending electromagnetic valve of the cab; step S200 is performed.

S200, ending.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.

The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (13)

1. A hydraulic shovel control system, comprising:

the device comprises an input device, a controller, an electric control pump, a cab ascending switch, a cab descending switch, a cab ascending electromagnetic valve and a cab descending electromagnetic valve;

the input device is connected with the controller and is used for receiving target required current, first target current and second target current of the electric control pump input by a user and transmitting the target required current, the first target current and the second target current of the electric control pump input by the user to the controller;

the electric control pump is connected with the controller and is used for controlling the ascending or descending of the cab and controlling the flow of hydraulic oil required by the ascending or descending of the cab according to an electric control pump control signal sent by the controller;

the control device comprises a controller, a cab lifting switch, a cab lifting electromagnetic valve, a first target current and a second target current, wherein the cab lifting switch and the cab lifting electromagnetic valve are connected with the controller, the cab lifting switch is used for sending cab lifting signals to the controller when being triggered by a user, the controller is used for receiving the cab lifting signals, controlling the electric control pump and the cab lifting electromagnetic valve to be opened according to the received cab lifting signals, controlling the electric control pump to work according to target required current, and controlling the opening of the cab lifting electromagnetic valve according to the first target current and the second target current so as to control the lifting speed of the cab;

The controller is used for receiving the cab descending signal, controlling to open the electric control pump and the cab descending electromagnetic valve according to the received cab descending signal, controlling the electric control pump to work according to target required current, and controlling the opening of the cab descending electromagnetic valve according to the first target current and the second target current so as to control the descending speed of the cab.

2. The hydraulic shovel control system according to claim 1 wherein the controller is configured to:

after receiving the cab lifting signal, controlling the opening of a cab lifting electromagnetic valve according to the first target current in a first stage in the cab lifting process, and controlling the opening of the cab lifting electromagnetic valve according to the second target current in a second stage in the cab lifting process; a first stage in the cab lifting process is located before a second stage in the cab lifting process;

after receiving the cab lifting stop signal, controlling the opening of a cab lifting electromagnetic valve according to the second target current in a first stage in the process of stopping lifting of the cab, and controlling the opening of the cab lifting electromagnetic valve according to the first target current in a second stage in the process of stopping lifting of the cab; the first stage in the process of stopping the lifting of the cab is positioned before the second stage in the process of stopping the lifting of the cab;

After receiving the cab descending signal, controlling the opening of a cab descending electromagnetic valve according to the first target current in a first stage in the cab descending process, and controlling the opening of the cab descending electromagnetic valve according to the second target current in a second stage in the cab descending process; a first stage in the cab descent process is located before a second stage in the cab descent process;

after receiving the cab descent control signal, controlling the opening of a cab descent solenoid valve according to the second target current in a first stage in the process of stopping the cab descent, and controlling the opening of the cab descent solenoid valve according to the first target current in a second stage in the process of stopping the cab descent; the first stage in the process of stopping the descent of the cab is located before the second stage in the process of stopping the descent of the cab.

3. The hydraulic shovel control system according to claim 2, further comprising: a proximity switch sensor;

the input device is used for receiving a third target current, a fourth target current and a fifth target current input by a user;

The proximity switch sensor is used for sending a cab ascending limit signal to the controller after detecting that the cab ascends to a limit position;

the controller is used for controlling the opening of the cab lifting electromagnetic valve according to the third target current and the fourth target current or controlling the opening of the cab lifting electromagnetic valve according to the fifth target current after receiving the cab lifting limit signal;

the proximity switch sensor is used for sending a cab descending limit signal to the controller after detecting that the cab descends to a limit position;

the controller is used for controlling the opening of the cab descent electromagnetic valve according to the third target current and the fourth target current or controlling the opening of the cab descent electromagnetic valve according to the fifth target current after receiving the cab descent limiting signal.

4. The hydraulic shovel control system according to claim 3 wherein,

the controller is used for:

after receiving the cab lifting limit signal, if the opening of the cab lifting electromagnetic valve is in a full-open state, controlling the opening of the lifting electromagnetic valve according to the third target current in a third stage in the process of stopping lifting of the cab, and controlling the opening of the lifting electromagnetic valve according to the fourth target current in a fourth stage in the process of stopping lifting of the cab; the third stage in the process of stopping the lifting of the cab is positioned before the fourth stage in the process of stopping the lifting of the cab;

After receiving the cab descending limit signal, if the opening of the cab descending electromagnetic valve is in a full-open state, controlling the opening of the descending electromagnetic valve according to the third target current in a third stage in the process of stopping descending of the cab, and controlling the opening of the descending electromagnetic valve according to the fourth target current in a fourth stage in the process of stopping descending of the cab; the third stage in the process of stopping the ascent of the cab is located before the fourth stage in the process of stopping the ascent of the cab.

5. The hydraulic shovel control system according to claim 3 wherein,

the controller is used for:

after receiving the cab lifting limit signal, if the opening of the cab lifting electromagnetic valve is in a non-full-open state, controlling the opening of the lifting electromagnetic valve according to the fifth target current in a fifth stage in the process of stopping lifting of the cab;

and after receiving the cab descending limit signal, if the opening of the cab descending electromagnetic valve is in a non-full-open state, controlling the opening of the descending electromagnetic valve according to the fifth target current in a fifth stage in the process of stopping the descending of the cab.

6. The hydraulic shovel control system according to claim 1 further comprising a cab emergency descent switch;

the cab emergency descent switch is used for sending a cab emergency descent signal to the controller when triggered by a user;

the controller is used for controlling the cab emergency descent electromagnetic valve to be opened after receiving the emergency descent signal.

7. The hydraulic shovel control system according to claim 6 further comprising an emergency drop manual valve;

the emergency descending manual valve is used for controlling the emergency descending of the cab according to the operation of a user outside the cab when the emergency descending switch of the cab is abnormal.

8. The hydraulic shovel control system according to claim 2, further comprising: a neutral position cut-off solenoid valve and a lifting interlocking solenoid valve; the middle position cutting electromagnetic valve and the lifting interlocking electromagnetic valve are connected with the controller, the middle position cutting electromagnetic valve is used for prohibiting the electric control pump from providing hydraulic oil for other hydraulic systems in the whole vehicle, and the lifting interlocking electromagnetic valve is used for ensuring that the whole vehicle only performs lifting operation of a cab;

the controller is used for:

After receiving the cab ascending signal or the cab descending signal, controlling the neutral position cutting electromagnetic valve and the lifting interlocking electromagnetic valve to be opened; and after receiving the cab lifting stop signal or the cab descending stop signal, controlling the middle position cutting electromagnetic valve and the lifting interlocking electromagnetic valve to be closed.

9. The hydraulic shovel control system according to claim 6 wherein,

the controller is used for:

when the real-time rotating speed of the engine is lower than the target rotating speed of the engine, if an emergency descending signal is received, the emergency descending electromagnetic valve of the cab is controlled to be opened;

or when the interruption time of the controller and the input device exceeds a first preset time and/or the interruption time of the controller and the engine controller exceeds a first preset time, if an emergency descent signal is received, the emergency descent electromagnetic valve of the cab is controlled to be opened.

10. A hydraulic shovel comprising the hydraulic shovel control system according to any one of claims 1 to 9.

11. A hydraulic shovel control method, which is applied to the hydraulic shovel control system according to any one of claims 1 to 9, comprising:

After receiving the cab lifting signal, the controller controls and opens the electric control pump and the cab lifting electromagnetic valve according to the received cab lifting signal, controls the electric control pump to work according to the target required current, and controls the opening of the cab lifting electromagnetic valve according to the first target current and the second target current so as to control the lifting speed of the cab;

after receiving the cab descending signal, the controller controls and opens the electric control pump and the cab descending electromagnetic valve according to the received cab descending signal, controls the electric control pump to work according to the target required current, and controls the opening of the cab descending electromagnetic valve according to the first target current and the second target current so as to control the descending speed of the cab.

12. The hydraulic shovel control method according to claim 11 wherein the controller, upon receiving a cab up signal, further comprises:

the controller judges whether the electric control pump reaches a target working state and whether the real-time rotating speed of the engine reaches the target rotating speed of the engine;

if yes, judging whether a cab ascending limit signal is detected;

If yes, controlling the opening of the cab lifting electromagnetic valve according to the third target current and the fourth target current, or controlling the opening of the cab lifting electromagnetic valve according to the fifth target current;

if not, the electric control pump and the cab lifting electromagnetic valve are controlled to be opened according to the received cab lifting signal, the electric control pump is controlled to work according to the target required current, and meanwhile, the opening of the cab lifting electromagnetic valve is controlled according to the first target current and the second target current, so that the lifting speed of the cab is controlled.

13. The hydraulic shovel control method according to claim 11 wherein the controller, upon receiving a cab lowering signal, further comprises:

judging whether the electric control pump reaches a target working state and whether the real-time rotating speed of the engine reaches the target rotating speed of the engine;

if yes, judging whether a cab ascending limit signal is detected;

if yes, controlling the opening of the cab-descending electromagnetic valve according to the third target current and the fourth target current or controlling the opening of the cab-descending electromagnetic valve according to the fifth target current;

if not, the electric control pump and the cab descending electromagnetic valve are controlled to be opened according to the received cab descending signal, the electric control pump is controlled to work according to the target required current, and meanwhile, the opening degree of the cab descending electromagnetic valve is controlled according to the first target current and the second target current, so that the descending speed of the cab is controlled.